Apparatus for controlling a discharge lamp in a backlighted disp

Details Apparatus for controlling a discharge lamp in a backlighted disp Apparatus for controlling a discharge lamp in a backlighted disp

1998-12-11

2000-09-05

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315224, 315247, G05F 100

Patent

active

061148148

ABSTRACT:
The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL). The output is a fairly pure sine wave which is proportional to an input control voltage. The output waveform purity is ensured by driving a symmetrical rectangular waveform into a second-order, low pass filter at the resonant frequency of the filter for all conditions of line voltage and delivered power. Operating stress on the step-up transformer is minimized by placing the load (lamp) directly across the secondary side of the transformer. When configured to regulate delivered power, the secondary side may be fully floated which practically eliminates a thermometer effect on the operation of the lamp. All of the active elements, including the power switches, may be integrated into a monolithic silicon circuit.

REFERENCES:
patent: 5550436 (1996-08-01), Honk
patent: 5604411 (1997-02-01), Venkitasubrahmanian et al.
patent: 5615093 (1997-03-01), Nalbant
patent: 5642065 (1997-06-01), Choi et al.
patent: 5754012 (1998-05-01), LoCascio et al.
J. R. Coaton and A. M. Marsden, Lamps and Lighting, Joh Wiley & Sons, Inc. pp. 322-324, 1997.

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